Question

让我们说我的模型看起来像这样。

public class OrganizationDTO
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<StorageDTO> Storages { get; set; } = new List<StorageDTO>();
}

public class StorageDTO
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<OrganizationDTO> Organizations { get; set; } = new List<OrganizationDTO>();
}

组织可能有多个存储空间，所以基本上我想在我的表中复制每个存储的组织。我想在下面的表格记录中显示

组织1 |存放1

组织1 |存储2

组织1 | Storage3

组织1 | Storage4

组织2 |存放1

组织2 |存储2

我尝试按存储集合对它们进行分组，但它并没有像我想要的那样复制我的记录。

 var result = Context.Storages
    .SelectMany(org => org.Organizations)
    .GroupBy(org => org)
    .Select(grouping => grouping.FirstOrDefault())
    .OrderBy(org => org.Name)
    .ProjectTo<SomeDTO>();

Answer 1

看起来你只是想要平息关系。

var query =
  from storage in Context.Storages
  from org in storage.Organizations
  select new {Storage = storage, Organization = org };

var result = query
  .OrderBy(row => row.Organization.Name)
  .ProjectTo<SomeDTO>();

Answer 2

            var result = Context.Organizations
            .SelectMany(organizationDTO =>organizationDTO
                .Storages
                .Select(storage => 
                    new {organizationDTO, storage}));

Linq - 按集合重复记录

2 个答案: